Injury and lost blood from trauma can cause your body to be in shock (low blood pressure related to blood loss). This decreased blood flow can lead to organ damage. In order to restore the blood pressure and blood flow, the medics give fluids into the patients' veins as soon as possible. This is called "resuscitation." The resuscitation fluid most commonly used is "isotonic" or one that is the same concentration as the blood. The investigators are trying to determine if infusing a "hypertonic" fluid (or one more concentrated than the blood) can increase the blood pressure and restore blood flow more efficiently. The hypertonic fluids the investigators are using are called hypertonic saline with dextran (HSD) and hypertonic saline (no dextran). Hypertonic saline is a salt solution that is slightly more concentrated than your blood. Dextran is a sugar solution.